body {
    text-align: center;
}

.header {
    position: fixed;
    left: 0;
    top: 0;
    width: 80%;
    height: 60px;
    line-height: 60px;
    background: #000;
    padding: 0 10%;
    z-index: 10000;
}

.header h1 {
    color: #fff;
    font-size: 20px;
    font-weight: 600;
    text-align: center;
}

.install-box {
    margin: 100px auto 0;
    background: #fff;
    border-radius: 10px;
    padding: 20px;
    overflow: hidden;
    box-shadow: 5px 5px 15px #888888;
    display: inline-block;
    width: 680px;
    min-height: 500px;
}

.protocol {
    text-align: left;
    height: 450px;
    overflow-y: auto;
    padding: 10px;
    color: #333;
}

.protocol h2 {
    text-align: center;
    font-size: 16px;
    color: #000;
}

.step-btns {
    padding: 20px 0 10px 0;
}

.copyright {
    padding: 25px 0;
}

.copyright, .copyright a {
    color: #ccc;
}

.w200{width:200px!important;}